http://www.skepticalscience.com/skakun-co2-temp-lag.html
I offer this for your viewing pleasure, note I don't actually buy what the link claims.
Its fun though. Polar CO2 Temps are not indicative of global temps when they need to get past the co2 lagging temps issue but then as soon as they are clear of that the melting ice is proof positive of global warming.
Its enough to make a polar bear want to take a swim.
Yeah, that was amusing. They throw out ice core samples as reliable indicators of global temperatures yet that's all there is to go by if you're going to go beyond a few thousand years ago. We don't have any 100,000 year old trees to check rings on.
There is just never any explanation for why and how there were periods in the distant past that were much warmer than the present or how plant and animal life managed to survive it in great abundance.